4.31 Well-designed space around buildings can add greatly to the attractiveness of a development, especially where the principles of defensible space are applied. A variety of garden sizes and usable open spaces will promote diversity and give greater choice for potential residents. Developers should therefore make adequate provision for private open space in the form of gardens, patios, balconies or terraces, depending on the characteristics of the development proposed and the surrounding context. All houses will need to provide some in-curtilage open space. The provision of adequate private garden space is particularly important for new family dwellings – generally dwellings with 3 or more bedrooms. For apartment developments private open space may be provided in the form of communal gardens where appropriate management arrangements are agreed.